An accident that occurs while utilizing a wiimote, usually the wiimote flying off of the wrist and colliding with some important stuff you have. Such "stuff" could include expensive HDTVs, family heirlooms, the face of the person that bought you your Wii, or maybe your newborn puppy batch.

Dustin: Hey Dugan! How's that new Wii or yours working out?
Dugan: Not good. I had a bit of a wiincident and broke my grandmother's old ceramic vase.
Dustin: Oh no! What'd she say!
Dugan: Nothing. She's been dead for like 8 years.
Dustin: Oh...*awkward pause* She probably deserved it.
Dugan: You mean dying of old age?
Dustin: Yep.